Fires have long been a natural part of forest ecosystems, but something is changing. Our new study shows that forest fires have become more widespread and severe amid global heating, particularly in the high northern latitudes such as Canada and Siberia where fires are most sensitive to hotter, drier conditions.
The implications of this are alarming, not just for the ecosystems affected or the cities engulfed by smoke downwind, but for the planet’s ability to store carbon and regulate the climate. The trend we discovered contrasts with declining fire extent in savannah grasslands, which may reflect the expansion of farming and changing rainfall patterns.
We established the leading causes of forest fires in different parts of the world using an AI algorithm. It grouped forest regions into distinct zones with similar fire patterns and underlying causes, uncovering the worrying extent to which climate change is fuelling the expansion of forest fires in Earth’s high northern latitudes.
